Adobe 22001438 Accessibility Guide - Page 110
is three columns wide, or RowSpan=2 for a cell that is two rows deep.
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ADOBE ACROBAT 7.0 103 Section 13: Fixing advanced accessibility problems Incorrect tagging structure for a table (top) and the corrected tagging structure for the table (bottom). The corrected structure has tags for all header cells, including tags that are at the same level as the tags for rows that contain both types of cells. Tables that are a straightforward grid provide the greatest accessibility. That is, each row has the same number of columns, and each column has the same number of rows. Many tables, however, merge cells to make a single cell span two or more columns or rows. Merging cells across columns or down rows creates problems for screen readers unless you properly assign ColSpan and RowSpan attributes to the or tag of the merged cell. These attributes tell the screen reader how many columns or rows a particular cell spans (such as ColSpan=3 for a cell that is three columns wide, or RowSpan=2 for a cell that is two rows deep). For tables that contain blank cells, you may also need to add empty cells into the tree structure, so that each row or column has the same number of cells. This enables the screen reader to present the content in a way that doesn't confuse the user.